Congressman Diane Black celebrates with family and friends at her viewing party for as she wins 6th District at Barefoot Charlie's Restaurant August 4, 2016 in Hendersonville, Tenn.
Samuel M. Simpkins/ The Tennessean

State Rep. Charles Sargent (R-Franklin) is greeted by his wife Nancy at Puckett's Grocery & Restaurant in Franklin on Aug. 4, 2016. Sargent won the race for District 61 in the GOP primary. Price Chambers / For The Tenness

Congressman Diane Black hugs friend and supporter Tommy Whittaker at her viewing party for the 6th District at Barefoot Charlie's Restaurant August 4, 2016 in Hendersonville, Tenn. Samuel M. Simpkins/ The Tennessean

65th District House Republican candidate Sam Whitson is hugged by his campaign manager Mary Kate Anderson Brown during Whitson election night party in Franklin on August 4, 2016. Shelley Mays / The Tennessean

Congressman Diane Black talks with friends and supporters Roxanne Martingale and Baker Ring at her viewing party as she wins 6th District at Barefoot Charlie's Restaurant August 4, 2016 in Hendersonville, Tenn.
Samuel M. Simpkins/ The Tennessean

Congressman Diane Black celebrates with family and friends at her viewing party for as she wins 6th District at Barefoot Charlie's Restaurant August 4, 2016 in Hendersonville, Tenn. Samuel M. Simpkins/ The Tennessean

Congressman Diane Black celebrates early numbers with her son, Steve Black, left, Brandon Cherry, pink shirt, and Michael Detwiler, center at her viewing party for the 6th District at Barefoot Charlie's Restaurant August 4, 2016 in Hendersonville, Tenn. Samuel M. Simpkins/ The Tennessean

Congressman Diane Black talks with her Field Representative Michael Detwiler at her viewing party for the 6th District at Barefoot Charlie's Restaurant August 4, 2016 in Hendersonville, Tenn. Samuel M. Simpkins/ The Tennesse

Congressman Diane Black talks with Kim and Chip Smith at her viewing party for the 6th District at Barefoot Charlie's Restaurant August 4, 2016 in Hendersonville, Tenn. Samuel M. Simpkins/ The Tennessean

Diane Black hugs grandson Easton Shiver as she talks with friend Rochelle Hayes at her viewing party for for the 6th District at Barefoot Charlie's Restaurant August 4, 2016 in Hendersonville, Tenn. Samuel M. Simpkins/ The Tennessean

Staying just outside the 100ft boundary, Carolyn Leach-Broyles and her bullhorn greets every voter with a push for her candidate as they arrive or leave during Thursday's primary election at the Bordeaux Library.
Thursday Aug. 4, 2016, in Nashville, Tenn. Larry McCormack / The Tennessean

Campaign workers greet voters with signs and suggestions about who to vote for as they arrive during Thursday's primary election at the Bordeaux Library.
Thursday Aug. 4, 2016, in Nashville, Tenn.
Larry McCormack / The Tennessean

Poll worker Donna Jones looks out the window at Denton's Chapel in District 1 as she waits for the first voters of the morning to arrive.
Turn out for Thursday's primary election was small but provides voters an opportunity to weigh in on contentious races for Metro school board seats, Metro council, the state legislature and Congress.
Thursday Aug. 4, 2016, in Nashville, Tenn. Larry McCormack / The Tennessean

A new study by the Pew Research Center shows that for the past eight years Tennessee has been one of the worst states in the nation for voter turnout, hitting an all-time low in 2014. Larry McCormack / The Tennessean

Roslyn Gooch and Donna Prosser check in voters at Denton's Chapel in District 1.
Turn out for Thursday's primary election was small but provides voters an opportunity to weigh in on contentious races for Metro school board seats, Metro council, the state legislature and Congress.
Thursday Aug. 4, 2016, in Nashville, Tenn. Larry McCormack / The Tennessean

A resident leaves after casting his vote at Denton's Chapel in District 1.
Turn out for Thursday's primary election was small but provides voters an opportunity to weigh in on contentious races for Metro school board seats, Metro council, the state legislature and Congress.
Thursday Aug. 4, 2016, in Nashville, Tenn. Larry McCormack / The Tennessean

Residents cast their votes at Denton's Chapel in District 1
Turn out for Thursday's primary election was small but provides voters an opportunity to weigh in on contentious races for Metro school board seats, Metro council, the state legislature and Congress.
Thursday Aug. 4, 2016, in Nashville, Tenn. Larry McCormack / The Tennessean

The most closely watched race will be who wins the Williamson County seat currently held by Rep.Jeremy Durham,who suspended his re-election bid one day after the release ofa blistering Tennessee attorney general's report detailing accusations of Durhamengaging in inappropriate sexual encounters with 22 women. Larry McCormack / File / The Tennessean

The most interesting congressional race for Middle Tennessee will beU.S. Rep. DianeBlack's re-election effort. She is squaring off againstJoeCarr(right), who narrowly lost his effort to unseatU.S.Sen. Lamar Alexanderin 2014. File / The Tennessean

Another interesting race involves U.S.Rep. Scott DesJarlais, R-Tenn., pictured right, who faces a primarychallengefromGrant Starrett, a 28-year-old attorney trying to run to the right of the controversial South Pittsburg lawmaker. File / Gannett

Frogge, a charter opponent, contrasted the pro-charter campaign of Druffel. And the future of Hillwood High School also separated the two. Frogge has been a proponent of moving the school to Bellevue, but has tempered that response by saying she'd do what families ultimately decide. Druffel has called for a new Bellevue school, but also using the Hillwood building for another school.

But more than any other race, the presence of Stand for Children seemed to be most felt in the race between Frogge and Druffel. The special interest group spent more than $200,000 on Nashville school board races for several pro-charter challengers.

From the negative mailers and polling against Frogge and rebuttals from TNRefineEd with negative mailers against Druffel to the last minute petition by Tennessee Citizens Action questioning Stand's spending in every board race, school District 9 seemed to be the epicenter of groups attacking the candidates.

The questions surrounding Stand for Children came to a head on Wednesday, when consumer rights group Tennessee Citizen Action and a Metro Schools parent petitioned for an investigation into potential campaign finance violations involving the special interest group.

The petition cited a July 29 WSMV report that said Stand for Children director Daniel O'Donnell met with Druffel, who is running in District 9, during a 10-day mandatory blackout period before elections when PACs cannot contribute to a candidate. O'Donnell said he met with Druffel on a day he took off from work, according to the report.

Stand's attorneys called the allegations false. But the allegations and political activity turned an otherwise calm race between the candidates into a fight between those for and against growth in the number of Nashville charter schools.